Express the Set in Interval Notation $( - \infty , 9 )$

question 7

Multiple Choice

Express the set in interval notation.
-

• A) \(( - \infty , 9 )\)
• B) \(( - \infty , 9 ]\)
• C) \(( 9 , \infty )\)
• D) \([ - \infty , 9 ]\)

---

Definitions:

Circadian Rhythms

Biological processes that display an endogenous, entrainable oscillation of about 24 hours, regulating various physiological processes including the sleep-wake cycle.

PER Protein

A core component of the circadian clock in organisms, involved in maintaining the internal biological rhythm in sync with environmental cycles.

Marine Iguana

A species of iguana found only in the Galapagos Islands, notable for its unique adaptation to a marine lifestyle, including swimming and feeding on algae.

Foraging Start Times

The specific times at which animals begin their activity to search for food, influenced by environmental and internal biological factors.